Stamp-mill.



E. SHEFFIELD, JR.

STAMP MILL.

APPLICATION FILED JUNE 23, 1911.

Patented J an. 30, 1912.

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COLUMBIA PLANoupAPH 60., WASHINGTON, D. C.

E. SHEFFIELD, JR.

STAMP MILL.

APPLICATION FILED JUNE 23, 1911.

Patented Jan. 30, 1912.

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E. SHEFFIELD, JR.

STAMP MILL.

APPLICATION FILED JUNE 23', 1911.

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EDMUND SHEFFIELD, JR., OF GREENVIEW, CALIFORNIA.

STAMP-MILL.

Specification of Letters Patent.

Application filed June 23, 1911.

Patented Jan. 30,1912. Serial No. 634,943.

To all whom it may concern:

Be it known that I, EDMUND SHEFFIELD, Jr., a citizen of the United States, residing at Greenview, in the county of Siskiyou and State of California, have invented certain new and useful Improvements in StamplWIills, of which the following is a specification.

My present invention relates to improvements in stamp mills, and has for its leading object the provision of an improved device for shifting the stamp of a quartz crushing mill into and out of operating position without stopping the engine or the rotation of the cam shaft.

A further object of my invention is the provision of an improved mechanism which may be readily applied to an ordinary quartz mill stamp without necessitating any change in the construction or operation of the stamp and which will prove thoroughly efficient in acting in conjunction with the cam to raise the stamp into position where its tappet will be above the path of movement of the cam and to lock the stamp with its tappet in said elevated position.

Another object of my invention is the provision of an improved readily operable device which will upon the shifting of an operating lever either raise and lock the stamp out of engagement with the operating cam or will by reverse movement of the operating lever release the tappet to allow the stamp to resume operation, both results being attained by the expenditure of only the manual energy required to shift the lever.

Other objects and advantages of my improved device will be apparent from the following description taken in connection with the drawings, and it will be understood that I may make any modifications in the specific structure shown and described within the scope of my claims without departing from or exceeding the spirit of the invention.

Figure 1 represents a fragmentary front view of the cam shaft and stamp tappet operated thereby with my device applied in position. Fig. 2 represents a side elevation of Fig. 1 showing the position occupied by the various parts when my device is in operation with the cam at the upper limit of its movement. Fig. 3 represents a rear View thereof. Fig. 1 represents a sectional View on the line 14 of Fig. 1. Fig. 5 represents a sectional view on the line 5 5 of Fig. 2. Fig. 6 represents a detailed view of the finger operating lever. Fig. 7 represents a sectional view on line 77 of Fig. 1, and Fig. 8 represents a vertical sectional view on the line 88 of Fig. 2. v

In the drawings, the numeral 1 designates the frame in which is journaled the cam shaft 2 supported in the open bearings 3 and bearing the double cam 4. Slidably mounted in the cross pieces 5 of the frame is the reciprocating shaft 6 of the stamp, said shaft 6 having the tappet collar 7 adapted to be engaged by the points of the cam in its rotation to be carried upward thereby and when released therefrom to drop downward to cause the crushing action of the stamp.

Secured to the front of the frame 1 is the,

base or supporting bar 8 upon which is mounted the hollow casing 9 having slidably mounted therein the bar 10 having the basal shoulder 11 and the depending portion 12 adapted to lie beside the locking bar 13 pivoted within the casing 9.by the pin let and having the operating loop or handle 15 which is secured to the member 13 and projects through the slot 16 of the casing 9. The bar 10 is formed with the turned or rounded upper end 17 on which is rotatably engaged the depending flange or collar 18 formed on the semi-circular finger plate 19, a locking washer 2O bearing against the upper face of the finger 19 and being secured to the end of the bar 10 to lock the finger rotatably upon the turned end of the bar. It will be observed that the casing 9 projects upwardly in close proximity to the shaft 6, and the upper end of the bar 10 is located just below the tappet 7 when the latter is in its lowermost position.

In the operation of my device, when I wish to lock the stamp in elevated position,

I swing the lever 21 having the oifset upper end 22 connected by the flexible link member 23 with the collar 18, the swinging of said lever serving through the link to rotate the finger to cause it to lie adjacent to the shaft 6 immediately below the tappet 7. As the cam 41: rotates one of its points will strike the under side of the finger l9 and will force it upward with the tappet 7, the bar 10 sliding in the guide casing 9. To operate the finger 19 and swing it into said position against the tension of the spring 24 which is coiled around the end of the bar within the collar of the finger and has one end secured to the bar and the other to the collar, I employ the lever 25 having a depending lug 26 for engaging the offset 22 of the lever 21.

i The lever is pivotally secured to the easing 9 by the stud 27 and has its lower end provided with the upturned lug or ear 28 through which passes the arm 29 of the link 30 which is pivoted intermediately of the shifting lever 31 having its upper end pivoted by the bolt 32 to the frame and having its lower end provided with the dog for securing said lever in adjusted position. Mounted on the arm 29 of the link on each side of the lug 28 is a heavy helical spring 3% bearing against one of the washers secured on the arm 29, while pivoted to the casing 9 is a spring pressed locking rod 36 having one end resting against the cam shaft and the other normally engaging the keeper or latch plate 37 of the lever 25 for preventing the pivotal movement of said lever, the cam shaft being provided with a pair of projections 38 adapted to engage the rod 36 and force it out of engagement with the keeper 37 just before either point of the cam is in position to engage the tappet 7.

lVhen it is desired to lock the stamp shaft and tappet in raised position, I shift the lever 31 to the right and lock it in said position, the spring 3% yielding to permit of the movement of the lever 31 while the lever 25 is held immovably by the keeper and locking rod 36. As the locking rod is shifted by the projection on the cam shaft to release the keeper, the force of the spring 34 will shift the lever 25 to the right at its lower end and to the left at its upper end, the lug 26 of the lever 25 engaging the oil"- set 22 of the lever 21, shifting said lever and throwing the finger adjacent to the shaft, when the cam will engage and simultaneo'usly elevate the finger and rod 10 to which it is secured and the tappet 7, the weight of the tappet and stamp resting on the finger 19 and preventing its spring 2 1 from throwing itoutward out of engagement with the cam as the offset is raised above the lug 26. As the cam passes out of engagement with the finger 19 said finger will be swung out of the path of movement of the cam by its spring 2 1, while the tappet will rest on the washer 20 at the upper end of the bar 10. To retain the bar 10 in raised position to support the tappet 7 approximately the thickness of the finger 19 above the circle of movement of the cam, I secure to the lower end of the lever 25 the blade spring member 39 which has its lower end engaged in the eye or loop 15 projecting from the pivoted locking bar 13, and as the lever 25 is swung to the right the spring will tend to shift the operating loop 15 and thus the bar 13 against the rod 10, and as said rod or bar 10 reaches its highest position impelled by the cam, the bar 13 will swing under the depending lug 12 of the bar 10 and will hold said bar in raised position, as is illustrated in the drawings. IVhen it is desired to again throw the stamp into operation, I shiftthe operating handle or lever 31 to the left and there secure it, the action of the spring 34: on the other side of the lever allowing of this shifting without moving the lever 25 until its keeper is released. VVhen the lever 25 is moved by the second spring 34 to shift its upper end to the right, the depending lug 26 engaging the upturned lower end a0 of the lever 21 to swing said lever toward the left at its upper end to move the finger 19 to be interposed between the cam and tappet 7. As the cam slightly raises the finger and rod 10 the weight of the device will be lifted from the locking bar 13 which will be swung to the left by the spring 39 out of engagement with the portion 12 of the rod 10 and will therefore allow the rod 10 to descend as the cam disengages the finger 19 until the shoulder 11 of the bar 1.0 engages the locking bar 15 and the parts are once more in their initial position with the cam operating against the tappet to cause the reciprocation of the stamp.

From the foregoing description taken in connection with the drawings, the construction and operation of my invention will be readily understood, and it will be seen that I have provided a thoroughly practical and efficient mechanism which serves upon the shifting of the operating lever to automatically interpose a block between the cam and the tappet, whereby the rotation of the cam lifts the interposed block and tappet until the latter is at a point above the path of movement of the cam, and it will further be observed that I have provided improved means for locking the tappet in said raised position and for automatically moving the block out of the path of movement of the cam as it is disengaged thereby. It will also be seen that I have provided an improved construction for reversing the movement of the various parts to reinsert the block between the cam and tappet and to disengage the locking means, whereby after the cam has engaged the block to slightly raise said block and tappet the locking means will permit the block and tappet to descend until the tappet is in its normal operating position while the block is automatically swung out of the path of movement of the cam.

It will be apparent to all those conversant with machines of this character that I have provided a simple and efficient device which is a great improvement over the former method of raising the tappets by manually inserting a block between the cam and tappet and then securing the tappet in elevated position.

I claim:

1. In a stamp mill, the combination with a supporting frame, of a reciprocating shaft mounted in the frame, a tappet on the shaft, a rotatable shaft bearing a cam for engaging the tappet, a casing secured in the frame adjacent the reciprocating shaft, a bar slidably mounted in the casing, a curved finger rotatably secured to the upper end of the bar, said bar having a depending port-ion, means for swinging the finger to interpose the same between the cam and tappet, a bar pivotally connected to the casing and adapted to engage the depending portion to hold the tappet in raised position when the finger is raised by the cam.

2. In a mill, the combination with a frame supporting the stamp shaft which is provided with a tappet, said bar having a depending portion, of a rotating cam member mounted in the frame for engaging the tappet, a casing secured in the frame parallel to the stamp shaft and disposed below the tappet, a bar slidably mounted in the casing, a curved finger rotatably mounted on the bar, a lever for rotating the finger to dispose the same between the cam and tappet, a series of levers for shifting the finger operating lever, a blade spring depending from one of the levers, a locking member mounted in the casing and having a projecting loop engaged by the blade spring, whereby when the bar is raised by the engagement of the cam with the finger carried by the bar the shifting of the levers causes the blade springs to move the locking member under the depending portion of the bar to lock the bar in said raised position and the reverse shifting of the levers through the blade spring causes the locking device to disengage said dependin portion.

In testimony whereof I aiiix my signature,

in the presence of two witnesses.

EDMUND SHEFFIELD, J R. Vitnesses:

T. B. MARKHAM, J. G. HARRIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

